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Патент USA US2120792

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June 14, 1938.
G.` W. YANNEY
2,120,792
CRANE DRIVE
Filed June 1‘7, 1936
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INVENTOR
'
June 14, 1938.
G. w. YANNEY
2,120,792
CRANE DRIVE
Filed June 17, 193s
2 Sheets-Sheet 2
25
INVENTOR
M',MM/M'
2,120,792
Patented June 14, 1938
UNITED STATES rATENT OFFICE
2,120,792
CRANE DRIVE
George W. Yanney, Alliance, Ohio, assignor to
The Alliance Machine Company, Alliance,
Ollio, a corporation of Ohio
Application June 17, 1936, Serial No. 85,708
8 Claims. (Cl. 10E-29)
This invention relates to a drive for cranes and
similar structures, and particularly for cranes of
the bridge and gantry type.
It is customary to drive gantry cranes by a
5 pinion at the foot of each supporting trestle, co
operating with racks mounted alongside the track
rails on which the wheels supporting the crane
travel.
A so-called “squaring shaft”, including
vertical shafts, a horizontal cross shaft and suit
l0 able bevel gearing, connects the drive pinions so
that they move in synchronism and maintain the
longitudinal axis of the crane precisely perpen
dicular to the track rails at all times.
Occasionally, because of local conditions, it is
desirable that a crane traverse a path including
a curved portion. It is an object of this inven
tion to provide a drive for a bridge or gantry
crane adapted to traverse curved paths where
by the longitudinal axis of the crane is main
20 tained in a true radial position at all times while
the crane is traversing the curved portion of its
path. In accordance with my invention, I pro
vide, in addition to the usual racks along the
straight portions of the path and the driving
p-inions on the crane trestle cooperating there
with, an additional rack along the curved por
tion of the track, at the outside thereof, and an
additional pinion on the crane at the, end there
of on the outside of the curve, for meshing with
30 said last-mentioned rack.
This rack and pinion
have a greater tooth pitch than the racks along
the straight portions of the track, and the pin
ions cooperating therewith. The additional pin
ion is driven by the same mechanism which
drives the usual pinions and moves at the same
angular velocity as the latter. It is preferably
spaced axially from the usual driving pinion on
the end of the crane adapted to traverse the out
side of the curve.
For a complete understanding of the inven
40
tion, reference may be had to the accompanying
drawings which illustrate a present preferred
embodiment.
In the drawings,
Fig. 1 is a diagrammatic plan view showing a
gantry crane and a track along which it is
adapted to travel, including straight and curved
portions;
Fig. 2 is a partial side elevation of a crane;
Fig. 3 is a partial end View of one of the crane
trestles, to enlarged scale;
Fig. 4 is a sectional View along the line IV-VI
of Fig. 3; and
Fig. 5 is a View similar to Fig. 4 showing the
drive for the opposite end of the crane.
Referring now in detail to the drawings, a gan
try crane IIB comprises a bridge, a portion of which
is shown at II, and supporting trestles I2 and I3.
The lower ends of the trestles rest on sills I4 and
I5, preferably composed of structural shapes
fabricated according to well known designs.
Four-wheel trucks I6 (see Fig. 3) are swivcled to
each end of both sills and are adapted to travel
along a track I'I. The track includes straight
sections I3 and I9 connected by a curved section
2|), the track rails on the inside of the curve being
indicated at 2| and those on the outside of the
curve at 22. The points of tangency between the
straight and curved portions of the track are
indicated by the dot-and-dash lines I8’ and I9'. ~
Racks 23 and 24 extend along the inside and
outside rails 2| and 22, respectively, throughout
the straight sections I8 and I9. A similar rack
25 extends along the inside rail 2| throughout
the curved portion 2E! of the track. The racks
23, 24 and 25 may conveniently be disposed be
tween the track rails 2| and 22 and supported
in any convenient manner (not shown). The
rack 25, of course, is simply a continuation of
the racks 23 except that it is curved instead of 25
straight as are the latter.
Referring now more particularly to Figs. 4 and
5, a driving motor 26 is mounted on each sill I4.
By means of reduction gearing 21, each motor
drives an intermediate shaft 28 journaled in -
suitable bearings 29 mounted on the sills I4. Pin
ions 3|) on the shafts 28 drive gears 3| keyed to
driving shafts 32 journaled in suitable bearings
33 carried by the structural shapes forming the
sill and indicated at 34. Pinions 35 are keyed to
the shafts 32 and mesh with driving pinions 36
keyed to shafts 36a journaled in bearings 31
mounted in bearing brackets 38 suspended below
the sills I4. The pinions 36 mesh with the racks
40
23, 24 and 25.
Vertical shafts 39 journaled in suitable bear
ings carried on the trestles I2 and I3 are driven
from the shafts 28 by bevel gearing 40.
The
shafts 39 are connected by a horizontal cross
shaft 4| extending therebetween and journaled
in suitable bearings 42 carried on the bridge II,
and bevel gearing 43. By this means, the driv
ing pinions 36 move at the same angular veloc
ity, even though each has its own driving motor,
and the trestles I2 and I3 always move at the
same speed, while traveling along straight
stretches of track. This maintains the longitu
dinal axis of the crane precisely perpendicular to
the track rails, and prevents binding of the sup
porting wheels or derailment of the trucks I6. 55
2
2,120,792
As will be seen by comparison of Figs. 4 and 5,
porting wheels spaced axially from each other
the drives for the two ends of the crane are
identical to a large extent. The drive for the
end of the crane adapted to traverse the outside
and adapted to traverse track rails having a
curve therein, of means for driving the crane
of the curved portion 20 of the track, however,
is provided with an additional driving pinion 44
keyed to the shaft 36a on which the pinion 36
is mounted. The pinion 44 is thus spaced axially
along the rails, including means for driving the
end of the crane on the outside of the curve at
a linear speed greater than that of the end of the
crane on the inside of the curve whereby to main
from the pinion 35 for cooperation with a rack'
tain the crane in a truly radial position at all
times while traversing the curve.
45 extending throughout the curved portion of
the track along the outside rails. The pinion 44
has a greater diameter than the pinions 36, but
porting wheels spaced axially from each other
has the same number of teeth which means sim
ply that pinion 44 has a greater tooth pitch than
15 pinions 36. The rack 45 diii‘ers similarly in pitch
from the racks 23, 24 and 25.
Since the pinion
44 is mounted on the same `shaft as the pinion
36 at the end of the crane traversing the outside
of the curve, the pinion144 will make one revolu
20 tion for every revolution of the pinions 36. The
pinion 44, however, when it engages the rack 45,
as the crane moves from either of the straight
portions or tangents I8 and ’I9 onto the curved
portion 20 of the track, will cause the end of the
25 crane traversing the outside of the track to move
at a linear speed greater than that at which the
end of the crane on the inside of the curve moves.
The difference between the diameters of the pin
ions 44 and 36, of course, is dependent on the
30 curvature of the curved portion 20 of the track
and may easily be determined mathematically.
2. The combination with a crane having sup
and adapted to traverse track rails having a curve
therein, of means for driving the crane along the
rails, and means eiîective when the crane trav
erses the curve, to drive the end of the crane on 15
the outside of the curve at a higher linear speed
than the end of the crane on the inside of the
curve.
3. A gantry crane having supporting trestles
at each end, track Wheels at the foot of each 20
trestle, adapted to traverse a track having
straight and curved- portions, a driving pinion
carried on each trestle for cooperation with fixed
racks extending along the straight portions, of
the track, means for driving the pinions concur
rently at the same speed, a rack on the out
last-mentioned rack, said last-mentioned pinion
of the crane on the outside of the curve moves
also being driven by said driving means.
length of curved track rail.
The longitudinal
axis of the crane is thereby maintained in a true
40 radial position relative to the curved track por
tion at all times While traversing the curve.
It will be observed that the racks 23 and 24
terminate at the ends of the rack 45.V The transi
tion from the straight portion of the track to the
45 curved portion, or vice versa, is thereby easily
made. The racks 24 and 45 overlap the lines I8'
and I9’ deñning the curved portion 20 of the
track because the driving shaft 36a is not dis
posed centrally of the trestle I2, but oit-center
50 thereof, adjacent one leg of the trestle as shown
in Fig. 3. By this arrangement, the change from
either of the racks 24 to the rack 45 is made
precisely at the time the central vertical plane
through the crane passes the boundary lines I8'
55 and I9’.
r
It will be clear from the foregoing description
that the invention makes it feasible to operate
bridge or gantry cranes over tracks including
curved portions. The limitation in the move
60 ment of bridge or gantry cranes to straight paths
is thus removed. A crane may even be caused
to traverse a reverse curve by providing the ad
ditional rack on the outside of each curve and
the additional driving pinion on both ends of the
To meet such conditions, it would only
be necessary to substitute the structure of Fig. 5
for that shown in Fig. 4.
Although I have illustrated and described here
in but'one preferred embodiment of the inven
70 tion, it will be apparent that changes in the con
struction disclosed may be made without depart
ing from the spirit of the invention or the scope
of the appended claims.
I claim:
1. The combination withV a crane having sup
65 crane.
25
side of the curved portion of the track having
a tooth pitch greater than that of the racks along
the straight portions of the track, and a pinion
on the trestle traversing the outside of the curved 30
portion of the track adapted to mesh with said
As a result of the construction described, the end
faster than the end on the inside, so as to trav
35 erse the greater length of the track rails 20 on
the outside of the curve in the same time that
the inner end of the crane traverses its shorter
10
4. A drive for a movable structure having sup
porting wheels spaced axially apart and adapted
to traverse a path having straight and curved
portions, comprising a rack adjacent one end of
the structure extending along the straight and
curved portions of said path, a second rack ad
jacent the other end extending along the straight 10
portion only of the path and terminating at the
curved portion thereof, pinions of the same size
and pitch journaled in said ends meshing with
said racks, means for driving said pinions at
the same angular velocity, a third rack extend
ing along the curved portion only of said path at
45
the same end of the structure as said second rack,
and a, pinion meshing with said third rack and
connected with said ñrst mentioned pinions so as
to rotate .at the same angular velocity but having 50
a pitch different from that of the ñrst mentioned
pinions.
5. An elongated wheeled structure move/ble
sidewise along a path including straight and
curved portions having driving pinions mounted 55
on each end meshing with ñxed racks, one of
which terminates at said curved portion, means
connecting the pinions whereby they operate
to move both ends of the structure at the same
Speed while traversing said straight portion, a 60
rack along said curved portion, and a pinion on
said structure meshing therewith when the latter
reaches` said curved portion, said last mentioned
rack and pinion being eiïective to move one end
of said structure at a lineal speed different from 65
that at which the other end is moved by its rack
and pinion.
6. The apparatus defined by claim 5, charac
terized by said last mentioned rack and pinion
having a tooth pitch differing from that of the 70
first mentioned racks and pinions.
7. A crane movable along rails, having a drive
comprising driving pinions on both ends of the
crane cooperating with fixed spaced racks ad
jacent said rails, means connecting said pinions 75
3
2,120,792
whereby to move both ends of the crane at the
same speed, and an additional rack adjacent a
curve in the rails and a third pinion journaled on
one end of the crane to cooperate with said addi
tional rack for driving said end of the crane at a
linear speed different from that at which the
other end is driven to maintain the crane radial
when traversing said curve, the ñrst mentioned
rack on the end adjacent said additional rack
w terminating where the lattei` begins.
8. An elongated movable structure having driv
ing pinions at both ends cooperating with ñxed
spaced racks, said pinions being connected by a
squaring shaft, ‘and an additional pinion coop
erating with a further fixed rack lying along a
curved portion of the path of the structure to Ui
move the end thereoi on the outside of the curved
portion at a greater linear speed than the end on
the inside, the ñrst mentioned rack on the end
adjacent the additional rack terminating Where
10
the latter begins.
»
GEORGE W. YANNEY.
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